Rotatable Endpin Holder Isolating Vibration
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Solution Overview
Problem
Conventional endpin holders for stringed instruments like the cello suppress natural resonance vibrations when the endpin is fixed, leading to altered sound and acoustic quality compared to playing without an endpin.
Innovation Solution
An endpin holder with a rotatably supported receiving member and a flattened dome-shaped supporting member that allows free vibrations by forming a space under the receiving member, which is open and in contact with the floor, and includes through holes for enhanced elasticity and strength, preventing vibration propagation to the floor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the tip portion of the endpin is caused to directly butt against the floor surface to fix the stringed instrument, then the instrument can be fixed in position, but the natural resonance vibrations of the body of the stringed instrument are suppressed and the sound quality becomes altered
Solution Approach 1:
The endpin holder acts as an intermediary between the endpin and the floor surface. The receiving member rotatably supported by the supporting member through a bearing provides a mediation mechanism that allows the endpin to be held in position while preventing direct rigid contact with the floor, thereby suppressing harmful vibration propagation while maintaining position fixation.
Solution Approach 2:
The receiving member is designed to be rotatable rather than fixed, introducing dynamic capability to the system. This rotation freedom allows the endpin holder to adapt to floor irregularities and reduces rigid constraints on vibration, enabling the instrument body to vibrate naturally while still maintaining positional stability during playing.
2Stability of the object's composition
If the tip portion of the endpin is fixed by using a conventional endpin holder to maintain position, then the instrument can be fixed, but the vibrations propagate to the floor causing floor sound and suppressing natural resonance
Solution Approach 1:
The rotatable receiving member supported by a bearing introduces dynamic freedom that prevents rigid energy transfer to the floor. This dynamic design allows the endpin to maintain positional stability while enabling the instrument body to vibrate naturally, thereby reducing energy loss through floor contact and preserving natural resonance.
Solution Approach 2:
The endpin holder is divided into distinct functional components: the receiving member for holding the endpin, the supporting member for structural support, and the bearing for enabling rotation. This segmentation allows each component to perform its specific function - the bearing specifically isolates vibrations by providing rotational freedom, preventing energy loss while maintaining position fixation.
3Reliability
If the receiving member is fixed rigidly to prevent movement, then the endpin position is stable, but the natural resonance vibrations of the cello are suppressed
Solution Approach 1:
The receiving member is designed with rotational freedom through the bearing rather than rigid fixation. This dynamic design maintains reliability by preventing the endpin from moving laterally or vertically during playing, while simultaneously allowing the instrument body to vibrate naturally by eliminating rigid constraints that would suppress resonance.
Solution Approach 2:
The degree of freedom parameter is changed from zero (rigidly fixed) to one (rotatable). This parameter change transforms the receiving member from a rigid constraint that suppresses vibration to a flexible support that maintains position stability while allowing natural resonance vibrations to occur freely.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The endpin holder allows the cello to maintain its natural resonance and acoustic quality by suppressing vibration propagation to the floor, enhancing sound and playability.
Implementation Method 1
the receiving member is rotatably supported by the supporting member through a bearing
Implementation Method 2
the supporting member (3) is formed in a flattened dome shape having a circumferential portion thereof protruding downward such that a space (5) is formed under the receiving member, said space (5) being open and in direct contact with a floor surface (F) when the endpin holder is placed on said floor surface, and the supporting member (3) has plural through holes (30) formed therein that cause the space (5) and an outer face side of the supporting member (3) to communicate with each other
Data Source
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AI summary
An endpin holder according to the invention includes a receiving member (2) that comprises a butting stage (21) against which a tip portion of an endpin (P) comprised by a cello is butted; and a supporting member (3) that supports the receiving member (2), wherein the receiving member (2) is rotatably supported by the supporting member (3). The receiving member (2) is rotatably supported by the supporting member (3) through a bearing. According to this configuration, when the cello including the endpin is played, the sound and the acoustic quality can be caused to approach to those of the natural resonance of the stringed instrument.